this appears to be unnecessary

packages/svelte/src/internal/client/reactivity/effects.js

@@ -599,15 +599,11 @@ function resume_children(effect, local) {
 	if ((effect.f & INERT) === 0) return;
 	effect.f ^= INERT;
 
-	// Ensure the effect is marked as clean again so that any dirty child
-	// effects can schedule themselves for execution
-	if ((effect.f & CLEAN) === 0) {
-		effect.f ^= CLEAN;
-	} else {
-		// If a dependency of this effect changed while it was paused,
-		// schedule the effect to update. we don't use `check_dirtiness`
-		// here because we don't want to eagerly recompute a derived like
-		// `{#if foo}{foo.bar()}{/if}` if `foo` is now `undefined
+	// If a dependency of this effect changed while it was paused,
+	// schedule the effect to update. we don't use `check_dirtiness`
+	// here because we don't want to eagerly recompute a derived like
+	// `{#if foo}{foo.bar()}{/if}` if `foo` is now `undefined
+	if ((effect.f & CLEAN) !== 0) {
 		set_signal_status(effect, DIRTY);
 		schedule_effect(effect);
 	}